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Low-carbon equivalent high strength and toughness cast steel

A high-strength toughness, carbon equivalent technology, applied in the field of low-alloy steel material casting, can solve the problems of inability to balance welding performance and strength indicators, and achieve the effect of improving material strength and low-temperature toughness

Active Publication Date: 2013-12-11
武汉武船金属制造有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a kind of low-carbon equivalent high-strength toughness cast steel and its Preparation

Method used

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  • Low-carbon equivalent high strength and toughness cast steel
  • Low-carbon equivalent high strength and toughness cast steel
  • Low-carbon equivalent high strength and toughness cast steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A low-carbon equivalent high-strength toughness cast steel, its preparation method includes the following smelting, pouring and heat treatment, its specific process flow and process parameters are:

[0033] (1) Smelting process

[0034] Smelting in a 7-ton electric arc furnace, select dry, oil-free and less rusty Q235 steel plate (Cr0.28%, Cu0.06%) scrap 6500Kg for smelting, when the scrap steel is melted and the temperature is 1541 °C, take sample No. 1 , measured C0.55%, Ni0.25%, Mo0.08%, P0.037%. Add 35Kg of electrolytic nickel, 23Kg of FeMo60-A molybdenum-iron alloy, and then decarburize by blowing oxygen. During the decarburization process, slag is continuously released and new slag is formed. Observe the flame and the atmosphere in the furnace, and take sample No. 2 (C0.31%, Ni0.79% , Mo0.27%, P0.009%). When the measured temperature is 1595°C, add 20Kg FeSi75Al0.5-A ferrosilicon alloy for pre-reduction, and continue to heat up. Bake for 1.5 hours;

[0035] The...

Embodiment 2

[0044] A low-carbon equivalent high-strength toughness cast steel, its preparation method includes the following smelting, pouring and heat treatment, its specific process flow and process parameters are:

[0045] (1) Smelting process

[0046] Smelting in a 7-ton electric arc furnace, select dry, oil-free and less rusty Q235 steel plate (Cr0.28%, Cu0.07%) scrap 6500Kg for smelting, when the scrap steel is completely melted and the temperature is 1534°C, take sample No. 1 , measured C0.56%, Ni0.14%, Mo0.04%, P0.033%. Add 46Kg of electrolytic nickel plate, 24Kg of FeMo60-A molybdenum-iron alloy, and then decarburize by blowing oxygen. The decarburization process continuously releases slag and creates new slag. Observe the flame and the atmosphere in the furnace. Take No. 2 sample and measure C0.35%, Ni0 .80%, Mo0.24%, P0.007%. When the measured temperature is 1600°C, add 20Kg of FeSi75Al0.5-A ferrosilicon alloy for pre-reduction, and continue to heat up. When the temperature r...

Embodiment 3

[0056] A low-carbon equivalent high-strength toughness cast steel, its preparation method includes the following smelting, pouring and heat treatment, its specific process flow and process parameters are:

[0057] (1) Smelting process

[0058] Smelting in a 7-ton electric arc furnace, select dry, oil-free and less rusty Q235 steel plate (Cr0.28%, Cu0.06%) scrap 6500Kg for smelting, when the scrap steel is melted and the temperature is 1545 °C, take sample No. 1 , measured C0.56%, Ni0.13%, Mo0.06%, P0.029%. Add 42Kg of electrolytic nickel, 23Kg of FeMo60-A molybdenum iron alloy, and then decarburize by blowing oxygen. During the decarburization process, slag is continuously released and new slag is formed. Observe the flame and the atmosphere in the furnace, and take sample No. 2 (C0.29%, Ni0.79% , Mo0.26%, P0.005%). When the measured temperature is 1603°C, add 20Kg of FeSi75Al0.5-A ferrosilicon alloy for pre-reduction, and continue to raise the temperature. When the temperat...

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Abstract

The invention relates to a low-carbon equivalent high strength and toughness cast steel. The low-carbon equivalent high strength and toughness cast steel comprises the following chemical components in percentage by weight: 0.12 to 0.18% of C; 0.30 to 0.60% of Si; 0.90 to 1.20% of Mn; 0.40 to 0.60% of Cr; 0.60 to 0.80% of Ni; 0.20 to 0.30% of Mo; not greater than 0.025% of P, not greater than 0.020% of S, 0.02 to 0.03% of V, 0.03 to 0.05% of Nb, not greater than 0.20% of Cu, and the balance of Fe. The low-carbon equivalent high strength and toughness cast steel has the beneficial effect that micro-alloying technology is introduced to the production of low-carbon cast steel, so that the strength of material and low-temperature toughness can be greatly improved on the premise that high welding performance is kept, and the demand of a key part of a gold mine train, namely, a supporting shaft, can be completely met.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel material casting, and in particular relates to a low-carbon equivalent high-strength toughness cast steel. Background technique [0002] Due to the harsh operating environment of the mine truck, poor working road conditions, low ambient temperature, long working hours, and large impact loads during work, its key components - supporting shafts and other castings are required to have high yield strength (not less than 585Mpa) and tensile strength (not less than 725Mpa), good plasticity (elongation not less than 20%) and toughness (impact at -40°C not less than 27J), and good weldability (carbon equivalent Cev≤0.60%) . [0003] The chemical composition and mechanical properties of 4B in the American standard ASTM A487 "Standard Specification for Steel Castings Suitable for Pressure Service" are as follows: [0004] [0005] When the ASTMA4874B material meets the strength index, Ce is gre...

Claims

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Application Information

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IPC IPC(8): C22C38/48
Inventor 于建才邓学林喻尚钟谢国峰周悠王小虎
Owner 武汉武船金属制造有限责任公司
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